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    • 8. 发明授权
    • Proximity sensor with adaptive threshold
    • 具有自适应阈值的接近传感器
    • US06933922B2
    • 2005-08-23
    • US10753343
    • 2004-01-09
    • Mark W. CaseboltMark R. Lee
    • Mark W. CaseboltMark R. Lee
    • G06F1/32G06F3/033G06M7/00G09G5/08H01J40/14H04Q7/20
    • G06F3/03543G06F1/3203G06F1/3231G06F1/3259H03K2217/94026Y02D10/155Y02D10/173
    • A proximity sensor measures receptor output with an energy source deactivated. The sensor then measures receptor output with the energy source activated. The measurements with the energy source activated are compared to the measurements with the energy source deactivated to compensate for the effect of ambient conditions. A near condition is recognized if the change between the two groups of measurements exceeds a designated value. To compensate for receptor output that may decrease after reaching a peak value during approach of an object, a near condition can be maintained until the change between the two groups of measurements no longer exceeds a different designated value. Multiple sensors can be used to avoid false near conditions caused by, e.g., placing a device equipped with the sensors next to a stationary object. In one embodiment, a sensor comprises an infrared light emitting diode and a phototransistor.
    • 接近传感器在能量源失效的情况下测量受体输出。 然后传感器在激活能量源的情况下测量受体输出。 将激活的能量源的测量与能量源的测量值进行比较,以消除环境条件的影响。 如果两组测量之间的变化超过指定值,则识别近似条件。 为了补偿在物体接近期间达到峰值之后可能减小的受体输出,可以保持接近的状态,直到两组测量值之间的变化不再超过不同的指定值。 可以使用多个传感器来避免由例如将装备有传感器的设备放置在固定物体旁边而导致的假个近的条件。 在一个实施例中,传感器包括红外发光二极管和光电晶体管。